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Method and apparatus for an object detection system using two modulated light sources

a light source and object detection technology, applied in distance measurement, height/levelling measurement, instruments, etc., can solve the problems of reduced number of pixels used, ambiguity of the position of the detected object,

Active Publication Date: 2013-12-03
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a system that can detect and track objects in a vehicle's surroundings using a modulated light source and a sensor. The system measures the time delay between the transmission of the light and the detection of the reflected light to calculate range data for the objects. By using a trilateration technique, the system can accurately determine the position of the objects relative to the vehicle. The system can also maintain a list of the detected objects and their positions based on the range data. This invention provides a more efficient and accurate way to detect and track objects in a vehicle's surroundings.

Problems solved by technology

However, due to the cost of pixels, a reduced number of pixels may be used.
Using a reduced number of pixels may result in ambiguity of the position of the detected object.

Method used

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  • Method and apparatus for an object detection system using two modulated light sources
  • Method and apparatus for an object detection system using two modulated light sources
  • Method and apparatus for an object detection system using two modulated light sources

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Embodiment Construction

[0012]There is shown in FIGS. 1 and 2 an object detection tracking system for detecting and tracking objects in a path of travel of a driven vehicle 10. FIG. 1 illustrates the driven vehicle 10 detecting and tracking the object 12 forward of the driven vehicle. It should be understood that the tracking system is not limited to the objects forward of the vehicle 10, but may be incorporated to detect objects in any surrounding direction of the vehicle 10.

[0013]Referring to both FIGS. 1 and 2, the object detection tracking system includes a first modulated light source 14, a second modulated light source 16, a controller 18, and a sensor 20.

[0014]The first modulated light source 14 is disposed on a first region of the vehicle 10, such as a front left bumper of the vehicle, for transmitting a first light signal into a target region. The first modulated light source 14 includes circuitry for modulating the first light signal. The first modulated light source may include, but is not limit...

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Abstract

An object detection tracking system for a vehicle includes a first modulated light source for transmitting a first light signal with a first propagation pattern into a target region and a second modulated light source for transmitting a second light signal with a second propagation pattern into the target region. A sensor measures light reflected off objects in the target region. A controller demodulates the measured light to detect when the first or second light signals are received. The controller determines respective ranges for generating a first set of range data for the first light signal and a second set of range data for the second light signal. The controller maintains an object tracking list that includes a position of detected objects relative to the vehicle. The position of each object is determined using trilateration of the first and second sets of range data.

Description

BACKGROUND OF INVENTION[0001]An embodiment relates generally to object detection and tracking.[0002]Object detection systems include a signal emitting source and a signal receiving unit. The signal emitting source transmits a signal in a respective direction exterior of a vehicle. The signal is typically a pulsed waveform that reflects off an object in the path of the transmitted signal. The signal receiving unit focused in a same direction of the transmitted signal receives at least a portion of the transmitted signal that is reflected off the object. The distance between the vehicle and the object is determined by the duration of time that elapses from the time when the signal is transmitted and the time when the signal is received at the vehicle.[0003]The signal emitting source in a light-based object detection system typically transmits a modulated light signal. The signal receiving unit for the light-based object detection system typically includes an array of pixels with each ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G01C3/08G01S17/931
CPCG01B11/002G01S17/42G01S17/66G01S17/936G01S17/931
Inventor ZENG, SHUQING
Owner GM GLOBAL TECH OPERATIONS LLC
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